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求20.5*0.12的最简便算法

20-12.5*0.12 =20-1.5 =18.5 没有简算,直接计算

12.5×0.23×25 = 12.5×2.3×2.5 = 12.5×(2.4-0.1)×(2.4+0.1) = 12.5×(2.4²-0.1²) = 2×2.5²×(2.4²-0.1²) = 2×2.5²×2.4²-2×2.5²×0.1² = 2×(2.5×2.4)² - 12.5×0.01 = 2×6² - 0.125 = 72 - 0....

24.5*0.12*0.87 = 2.5578

原式 =0.5x0.3x0.12+0.5x1 =0.5x0.036+0.5x1 =0.5x(0.036+1) =0.5x1.036 =0.518

不详

0.12×0.5×0.016简便运算 =0.16×0.016 =0.00096 直接算最简便

解: 3.6×12.5×0.8+3.6 =3.6(12.5X0.8+1) =3.6(10+1) =3.6X11 =39.6

解:12.5-12.5×0.2= 12.5×1-12.5×0.2 =12.5×(1-0.2) =12.5×0.8 =10

5:0.12 =500:12 =125:3 =125/3 =41又3分之2

12.5x0.4x0.8 =(12.5x0.8)x0.4 =10x0.4 =4 如有帮助请采纳, 如对本题有疑问可追问,Good luck!

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